Help! Best SEO Service for foreign sites?

Hello guys. I'm currently looking for a good SEO Service (I prefer One Time payment, but not required) for some foreign sites.
I have a bunch of italian sites in administration, and I would like to improve their SEO.
I can provide some articles in Italian about every niche I need, I only need a good SEO strategy and some guarantees.

I read a lot of SEO Services threads but I think it's better asking in a thread, instead of asking on 20 SEO Threads the same question. I even tried some of the services. But I need a service that can help the rankings for a foreign site, and I don't know if a service is good in English it will still be good in other languages.

@to all of you that are recommending to go to the Marketplace: I'm saying it again, I need suggestions from people that had success with a certain SEO Service on foreign sites. I used before some SEO Services, they worked good, but on ENGLISH sites.
Thanks for you suggestions, I am sincerely saying to you that I know how to look on the marketplace, but because there are A LOT of offers, I need a little bit of guidance. From people that USED a SEO Service on non-english sites and it worked, or from people that are OFFERING SEO Services and they know that the service is working well on FOREIGN sites.

If you don't have any advice, please stop telling me that I should go to the Marketplace section. Thanks for your understanding

the best SEO strategy would be link building and social sharing. Go to BHW "Link Building" section. You will see many SEO services there. I got some myself. Look for thread "Real Facebook,Twitter,Google,Linkedin Shares & Pinterest Pins-Best Social Sharing Serv"

The best seo strategy is bound around a simple and repeatable procedure. Many of the SEO link building services available on this forum will be a good starting point, but you need to understand that doing some SEO in a one time fashion and expecting miracles is going to disappoint you and your client. As for foreign sites, Italian, it makes no difference where you create your links from, but some with an Italian TLD would be beneficial but not totally necessary.

Your SEO strategy should simply be this: 1. Setup a solid link structure based around multiple tier levels with the top tier acting as the Buffer Network of websites, that will be the barrier against over optimization penalties from Penguin.

Secondly monitor your client rankings with some link building going directly to their landing pages and when they have hit the number one spot for just over a month, then direct your link building to the buffer network only.

This way you will then keep your client out of the over-optimization hotspot.

Naturally the last thing to consider, is this is going to be an on going cost to either you or your link building and monitoring team.

@Bodydubl - Thanks for your advices. Yes, I know that an one-time payment service will not help me on long term, but I want this as a starting point. After I see some movements in the SERPS, I can ofc subscribe to a monthly service.
Thanks again.

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